修复资产计费边界风险

资产生成预扣费改为 fail-closed，避免钱包异常时继续调用外部生成

新增钱包退款 outbox，退款失败时本地落盘并后台重放

拼图首图后台任务改用 SpacetimeDB claim 表实现跨实例互斥

计费 ledger id 统一绑定 request_id，并让前端重试复用 x-request-id

同步 SpacetimeDB bindings、后端架构文档和 Hermes 决策记录

server-rs/crates/spacetime-client/src/puzzle.rs

@@ -1,8 +1,10 @@
 use super::*;
 use crate::mapper::*;
+use crate::module_bindings::claim_puzzle_background_compile_task_procedure::claim_puzzle_background_compile_task;
 use crate::module_bindings::claim_puzzle_work_point_incentive_procedure::claim_puzzle_work_point_incentive;
 use crate::module_bindings::delete_puzzle_work_procedure::delete_puzzle_work;
 use crate::module_bindings::record_puzzle_work_like_procedure::record_puzzle_work_like;
+use crate::module_bindings::release_puzzle_background_compile_task_procedure::release_puzzle_background_compile_task;
 use crate::module_bindings::remix_puzzle_work_procedure::remix_puzzle_work;
 use crate::module_bindings::save_puzzle_ui_background_procedure::save_puzzle_ui_background;
 
@@ -194,6 +196,67 @@ impl SpacetimeClient {
         .await
     }
 
+    pub async fn claim_puzzle_background_compile_task(
+        &self,
+        input: PuzzleBackgroundCompileTaskClaimRecordInput,
+    ) -> Result<bool, SpacetimeClientError> {
+        let procedure_input = PuzzleBackgroundCompileTaskClaimInput {
+            task_id: input.task_id,
+            claim_id: input.claim_id,
+            session_id: input.session_id,
+            owner_user_id: input.owner_user_id,
+            claimed_at_micros: input.claimed_at_micros,
+        };
+
+        self.call_after_connect(
+            "claim_puzzle_background_compile_task",
+            move |connection, sender| {
+                connection
+                    .procedures()
+                    .claim_puzzle_background_compile_task_then(
+                        procedure_input,
+                        move |_, result| {
+                            let mapped = result
+                                .map_err(SpacetimeClientError::from_sdk_error)
+                                .and_then(map_puzzle_background_compile_task_procedure_result);
+                            send_once(&sender, mapped);
+                        },
+                    );
+            },
+        )
+        .await
+    }
+
+    pub async fn release_puzzle_background_compile_task(
+        &self,
+        input: PuzzleBackgroundCompileTaskReleaseRecordInput,
+    ) -> Result<bool, SpacetimeClientError> {
+        let procedure_input = PuzzleBackgroundCompileTaskReleaseInput {
+            task_id: input.task_id,
+            claim_id: input.claim_id,
+            session_id: input.session_id,
+            owner_user_id: input.owner_user_id,
+        };
+
+        self.call_after_connect(
+            "release_puzzle_background_compile_task",
+            move |connection, sender| {
+                connection
+                    .procedures()
+                    .release_puzzle_background_compile_task_then(
+                        procedure_input,
+                        move |_, result| {
+                            let mapped = result
+                                .map_err(SpacetimeClientError::from_sdk_error)
+                                .and_then(map_puzzle_background_compile_task_procedure_result);
+                            send_once(&sender, mapped);
+                        },
+                    );
+            },
+        )
+        .await
+    }
+
     pub async fn save_puzzle_generated_images(
         &self,
         input: PuzzleGeneratedImagesSaveRecordInput,